Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
  • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
  • A24C5/32—Separating, ordering, counting or examining cigarettes; Regulating the feeding of tobacco according to rod or cigarette condition
  • A24C5/34—Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes
  • A24C5/3412—Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes by means of light, radiation or electrostatic fields
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
  • G01N21/59—Transmissivity
  • G01N21/5907—Densitometers

Definitions

• Density detection device for taste articles or parts
• An object of the present invention is to provide a rod-shaped taste-making article or a part thereof having an aggregate of a large number of small pieces such as leaf tobacco or the like as a test object and to optically detect the density of the small pieces.
• a feed pack control of the amount of the tobacco rod to be introduced into the tobacco rod or a tobacco rod is provided. Can be used to eliminate defective products.
• the moisture contained in the time has a great effect on the correlation between the light extinction rate and the time.
• the light emitting element is an LED
• the light emission wavelength band is widened instead of a single wavelength, so that the light attenuation rate varies with the wavelength depending on the wavelength.
• the light transmitted through the gaps filled in the filling or the paper surface of the rod causes the light produced by the actual engraving. More light enters the light-receiving element than the amount of attenuation. Furthermore, a measurement error occurs due to the dark current of the light receiving element.
• the present invention has been made on the basis of the problems of the prior art, and a bar-shaped taste-making article or a part thereof having an aggregate of a large number of small pieces such as leaf tobacco is referred to as a subject. It is another object of the present invention to provide a density inspection device capable of optically inspecting the density of the small piece with high accuracy.
• an apparatus for optically detecting the density of a small piece of a bar-shaped taste-equipped article or a component thereof having an assembly of a large number of small pieces there is provided an apparatus for optically detecting the density of a small piece of a bar-shaped taste-equipped article or a component thereof having an assembly of a large number of small pieces.
• a first light source that emits a first light beam composed of light of a first wavelength that does not substantially transmit the small pieces
• a second light source that emits a second light beam composed of light of a second wavelength substantially transmitting the small piece
• a second measuring unit for measuring first and second reflected light amounts respectively corresponding to the first and second light beams included in the combined light beam reflected on the surface of the inspection object;
• a third measuring unit for measuring first and second passing light amounts respectively corresponding to the first and second light beams included in the combined light beam passing through the inspection object
• a second viewpoint of the present invention is the device according to the first viewpoint, wherein the second measuring unit is configured to calculate the first and second light beams included in the combined light beam reflected on the surface of the inspection object. By receiving and detecting both, the first and second reflected light amounts are measured.
• the second measuring unit includes the first and second light beams included in the combined light beam reflected on the surface of the inspection object.
• One of the first and second reflected light amounts is measured by receiving and detecting only one of the reflected light amounts, and the other of the first and second reflected light amounts is the same as the one reflected light amount. Calculate as what can be obtained from reflectance This is measured.
• a fourth aspect of the present invention is the apparatus according to any one of the first to third aspects, wherein a difference between a reference value representing the density of the small piece and a measured value of the density of the small piece obtained by the arithmetic circuit is provided.
• an apparatus for calculating an average value of fluctuation values obtained by the detection circuit with respect to a plurality of subjects and transmitting the average value to the control circuit Provide additional circuitry.
• a comparison / determination circuit for comparing the variation value with a threshold value and for determining the quality of the device under test is further provided.
• the small piece is a leaf tobacco
• the first and second wavelengths are 0.5 to 0.8, respectively. ⁇ , 1.2 to: 1.4 ⁇ .
• both the first and second light beams are composed of laser beam power.
• a ninth viewpoint of the present invention is the device according to the eighth viewpoint, wherein at least one of the first to third measurement units receives and detects the first and second light beams on the same optical path. Equipped with a composite light receiving element.
• the combined light beam emitted from the optical system to the object to be inspected is a parallel light beam.
• the first measuring unit is configured to further include: the composite light beam between the optical system and the test object.
• the first and second light beams are measured by receiving and detecting the first and second light beams included in the beam portion separated from the light beam.
• a twenty-second viewpoint of the present invention is the device according to any one of the first to eleventh viewpoints, wherein the device is disposed between the optical system and the object to be inspected, and is inclined to the object to be inspected.
• the optical system further comprises a mirror having a facing mirror surface and a hole aligned with the optical axis of the optical system, wherein the combined light beam from the optical system passes through the hole as a convergent light beam focused on the hole. While passing through the object to be inspected after passing through, the combined light beam reflected by the surface of the object to be inspected is reflected by the mirror and introduced into the second measuring unit.
• the embodiments according to the present invention include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent features.
• various inventions can be extracted by appropriately combining a plurality of disclosed constituent features.
• the omitted part is a well-known conventional technique. This will be supplemented as appropriate.
• the inspection object is made into the bar-shaped taste-equipped article or its components provided with the assembly of many small pieces, such as a tobacco leaf.
• the density of the small piece can be determined with high accuracy. Inspection is possible.
• FIG. 1 is a configuration diagram showing an apparatus for inspecting the density of leaf tobacco in a tobacco rod according to an embodiment of the present invention.
• Fig. 2 is a diagram showing a model in which the density of small pieces SP is measured by irradiating an infrared laser beam G1 to a wall-shaped test object composed of an aggregate of many small pieces SP.
• Fig. 3 is a diagram showing a model for measuring the density of small pieces SP by irradiating an infrared laser beam G1 to a rod-shaped test object composed of an aggregate of many small pieces SP.
• Figure 4 is a side view showing a composite light receiving element that receives and detects two different wavelengths of light beams on the same optical path.
• FIG. 5 is a configuration diagram showing an apparatus for inspecting the density of leaf tobacco in a tobacco rod according to another embodiment of the present invention.
• FIG. 1 is a configuration diagram showing an apparatus for inspecting the density of leaf tobacco in a tobacco rod according to an embodiment of the present invention.
• the inspection apparatus includes first and second light beams B 1 It has first and second light sources 12 and 14 each composed of a laser diode for emitting B 2.
• the first light beam B 1 of the first light source 12 comprises a laser beam having a single first wavelength of 0.7 ⁇ .
• the first wavelength is such that the first light beam ⁇ 1 substantially transmits through the wrapping paper W ⁇ of the tobacco rod TR to be inspected, but leaves the tobacco LS, which is an aggregate of a large number of small pieces. It is selected from the range of 0.5 to 0.8 ⁇ so that it is not substantially transmitted.
• the second light beam # 2 of the second light source 14 is composed of a laser beam having a single second wavelength of 1.
• the second wavelength is set to 1.2 to 1.4 so that the second light beam B2 is substantially transmitted through the wrapping paper WP and the engraving LS without being substantially affected by the moisture of the tobacco engraving LS. It is selected from the range of ⁇ .
• the first and second light beams Bl and B2 from the first and second light sources 12 and 14 are combined by the half mirror 16.
• the first combined portion C 1 that is, the combined light beam, which is combined toward the test subject, the tobacco mouth TR, passes through the collection lens 18 and the collimator lens 22 for approximately 5 minutes. After being shaped into a parallel light beam CB having a width of mm (for a diameter of 6 to 1 O mm of the tobacco rod TR), it is irradiated onto the tobacco rod TR.
• the second combined portion C 2 of the first and second light beams B 1 and B 2 separated from the first combined portion C 1 by the half mirror 16 is connected to the half mirror 24.
• the light is further divided and introduced into the first and second light receiving elements 26 and 28.
• First and second light receiving elements 26, 28 so that only light derived from first and second light beams B 1 B 2 is incident on first and second light receiving elements 26, 28, respectively.
• Enter The mouth is provided with a filter 32 for 0.7 ⁇ ⁇ and a filter 34 for 1.3 ⁇ , respectively.
• the amount of light received by the first and second light receiving elements 26 and 28 is measured by the light emission amount control circuit 36, whereby the first and second light beams included in the parallel light beam C ⁇ are measured.
• the first and second light emission amounts of Bl and ⁇ 2 are monitored.
• the light emission amount control circuit 36 calculates the first and second light emission amounts of the first and second light beams Bl, 2 included in the parallel light beam CB, and calculates the first and second light amounts so that these become constant.
• the output of the first and second light sources 12 and 14 is controlled by the feed pack.
• the first and second projected light amounts of the first and second light beams Bl and ⁇ 2 included in the parallel light beam C ⁇ ⁇ are transmitted from the projected light amount control circuit 36 to an arithmetic circuit 48 described later. You.
• the light is condensed via the condenser lens 4 4.
• the filter 111 for 1.3111 is provided between the third light receiving element 42 and the condenser lens 44, the third light receiving element 42 has Two light beams ⁇ Only the reflected light of 2 enters.
• the amount of light received by the pair of third light receiving elements 42 is measured by the arithmetic circuit 48, and the first and second light receiving elements included in the parallel light beam CB reflected on the surface of the tobacco rod TR in the arithmetic circuit 48. ⁇
• the first and second reflected light amounts of the second light beam Bl and ⁇ 2 are calculated.
• the amount of light received by the third light receiving element 42 is based on only the reflected light of the second light beam ⁇ 2, but the arithmetic circuit 488 calculates the reflected light of the second light beam ⁇ 2.
• the first and second reflected light amounts are calculated assuming that the first light beam B 1 is also reflected at the same reflectance as the reflectance calculated from the above.
• a light receiving element for receiving the reflected light of the first light beam B 1 may be further provided.
• the parallel light beam CB transmitted through the tobacco mouth TR is focused on the half mirror 54 by the focusing lens 52 with the light passing around the surface of the tobacco rod TR included.
• the light is then divided and introduced into the fourth and fifth light receiving elements 56 and 58.
• the fourth and fifth light receiving elements 56 are such that only the light originating from the first and second light beams B 1 and B 2 enter the fourth and fifth light receiving elements 56 and 58, respectively.
• a filter 62 for 0.7 ⁇ and a filter 64 for 1.3 ⁇ are provided at the entrances, respectively.
• the received light amounts of the fourth and fifth light receiving elements 56 and 58 are also measured by the arithmetic circuit 48 and included in the parallel light beam CB passing through the tobacco rod TR in the arithmetic circuit 48.
• the first and second passing light amounts of the first and second light beams Bl and ⁇ 2 are calculated. Since the first light beam B 1 having the wavelength of 0.7 ⁇ does not substantially pass through the tobacco LS of the leaf tobacco, the light incident on the fourth light receiving element 56 is separated by the gap between the LSs. And the light that has passed through the surface of the tobacco mouth TR.
• the second light beam ⁇ 1 having a wavelength of 1.3 zm substantially transmits through the cut LS of the leaf tobacco, so that the light incident on the fifth light receiving element 58 is the light transmitted through the cut LS and the light LS.
• Light passing through the gap between It is combined with the light that has turned around the surface of the tobacco mouth TR.
• the arithmetic circuit 48 amplifies the signals of the above-described first and second projected light amounts, first and second reflected light amounts, and received light amounts corresponding to the first and second transmitted light amounts, and, based on these, tobacco light. Calculate the density of LS of leaf tobacco in the head TR. First, this algorithm will be described with reference to FIGS. 2 and 3, which show simplified models.
• FIG. 2 is a diagram showing a model for measuring the density of the small pieces SP by irradiating an infrared laser beam G1 to a wall-shaped test object composed of an aggregate of many small pieces SP.
• FIG. 9 is a diagram showing a model in the case of performing the operation. In the model shown in FIG. 3, when the above factors are considered, the relationship between the projected light amount and the transmitted light amount of the laser beam G 1 is expressed by the following equation.
• I 0-I 2-I 3 (I-I 1 ) 'e X p (one ( ⁇ i ⁇ X i))... (1)
• the transmission coefficient ⁇ i of one leaf LS of each leaf tobacco can be known in advance.
• the total thickness ⁇ ⁇ i of the notch LS is closely related to the filling density of the notch, and the transmission coefficient i of the notch is substantially constant. Therefore, in the apparatus shown in FIG. 1 as well, by measuring the values corresponding to I, I 0, I 1, I 2 and I 3 in the equation (1), the transmission path of the parallel light beam CB is determined.
• the total thickness of the LS at time can be obtained. Further, if the total thickness is known, the packing density of the LS can be calculated with high accuracy by multiplying the total thickness by a predetermined coefficient.
• the laser beam G 1 of the model shown in FIG. 3 corresponds to the collimator lens 22 and the second light beam B 2 included in the parallel light beam CB that emerges.
• I in the equation (1) is a parallel light beam emitted from the collimator lens 22. This is equivalent to the projected light amount of the second light beam B 2 included in CB (calculated by the projected light amount control circuit 36).
• I i in the equation (1) corresponds to the reflected light amount (received by the light receiving element 42) of the second light beam B2 included in the parallel light beam CB reflected on the surface of the tobacco mouth TR.
• IQ in the expression (1) corresponds to the amount of light (received by the light receiving element 58) of the second light beam B2 included in the parallel light beam CB passing through the tobacco rod TR.
• I 2 ⁇ Pi I 3 of equation (1) corresponds to a portion of the second light beam B 2 pass amount included in the parallel light beam CB for over-passing the tobacco Rod TR. For this reason, I 2 and I 3 cannot be directly measured in the apparatus shown in FIG.
• the present invention based on the net amount of light emitted and the amount of light passing through the first light beam B 1, the amount of light that has entered the surface of the tobacco rod with respect to the second light beam B 2. It is possible to estimate the total noise light amount I 2 + I 3 of the light passing through the time interval.
• the arithmetic circuit 48 first calculates the net projected light amount of each of the first and second light beams Bl and B2.
• the net projected light amount is reflected on the surface of the tobacco opening TR from the projected light amounts of the first and second light beams Bl and B2 included in the parallel light beam CB emitted from the collimator lens 22. It is obtained by subtracting the reflected light amounts of the first and second light beams Bl and B2 included in the parallel light beam CB.
• the projected light amounts of the first and second light beams B 1 B 2 are calculated by the projected light amount control circuit 36 based on the received light of the first and second light receiving elements 26 and 28. .
• the reflected light amounts of the first and second light beams Bl and B2 are equal to the third light receiving element 4 This is calculated by the arithmetic circuit 48 based on the light reception of No. 2. Next, the ratio (decay rate) of the passing light amount of each of the first and second light beams Bl and B2 to the net projected light amount is calculated. The passing light amounts of the first and second light beams Bl and B2 are calculated by the arithmetic circuit 48 based on the light received by the fourth and fifth light receiving elements 56 and 58. As described above, since the first light beam B 1 having the wavelength of 0.7111 does not substantially pass through the tobacco LS of the leaf tobacco, the light incident on the fourth light receiving element 56 is not irradiated during the LS.
• the light that has passed through the gap between the light and the light that has turned around the surface of the tobacco rod TR is synthesized.
• the second light beam B 1 having a wavelength of 1.3 / zm substantially transmits through the tobacco LS of the leaf tobacco
• the light incident on the fifth light receiving element 58 is the same as the light transmitted through the LS. Then, the light that has passed through the gap between the times LS and the light that has passed around the surface of the tobacco rod TR are combined.
• the total noise light amount of the light that has passed around the surface of the tobacco rod and the light that has passed through the time interval for the second light beam B 2 is calculated from the net light projection amount and the light passing amount of the first light beam B 1. presume. Then, by subtracting this total noise light amount from the light amount passing through the second light beam B2, the transmitted light amount of the second light beam B2 that has passed through the time stamp L S is obtained.
• the attenuation rate of the first light beam B 1, that is, (the amount of transmitted light) / (net projected light amount) is 10%
• the attenuation rate of the second light beam B 2, that is, (the amount of transmitted light) / (net) Is 30%.
• 10% passes through the light and the time passing around the surface of the tobacco rod. It is estimated that the remaining 20% is due to the light that has passed through the LS.
• ALU 4 projection amount of net that has been calculated in earthenware pots this good permeability coefficient and - - (1 3 1 one 1 2.),
• the arithmetic circuit 48 is an integration circuit for integrating the signal in a time of 100 ⁇ S to lmS in order to eliminate the influence of noise that may occur instantaneously in the detection signal. including.
• the density signal Y indicating the density of the interval L S calculated by the arithmetic circuit 48 is transmitted to the mass variation detecting circuit 72.
• the variation detection circuit 72 calculates the difference (X—Y) between the variation reference signal X, which is the reference value of the density of the tobacco leaf LS, and the density signal Y calculated by the arithmetic circuit 48 as the variation value. Calculate as ⁇ .
• the quantity reference signal X is a voltage corresponding to the amount of transmitted light that attenuates at the time of filling the standard determined by the type of tobacco.
• the variation value ⁇ calculated by the mass variation detection circuit 72 is transmitted to the integration circuit 73.
• the integrating circuit 73 integrates the fluctuation value a over a long period of time to calculate a fluctuation average value am for the number 100 cigarette rods TR.
• the variation average value am calculated by the integration circuit 73 is associated with the manufacturing system 80 of the tobacco rod TR. Is transmitted to the quantity control circuit 74.
• the quantity control circuit 74 controls the quantity of the indentation LS charged in each tobacco rod TR in the tobacco rod TR manufacturing system 80 based on the variable average value am.
• the variation value ⁇ calculated by the variable variation detection circuit 72 is also transmitted to the comparison determination circuit 76.
• the comparison judgment circuit 76 compares a threshold signal j3, which is a threshold value of the variation value ⁇ , which is set and input in advance, with the variation value calculated by the mass variation detection circuit 72. Judge the quality of this TR. If the cigarette mouth TR is determined to be defective ( ⁇ ⁇ a), the exclusion signal ⁇ is transmitted from the comparison determination circuit 76 to the exclusion circuit 78.
• the elimination circuit 78 eliminates the tobacco rod TR determined to be defective from the production line based on the exclusion signal ⁇ .
• FIG. 5 is a block diagram showing an apparatus for detecting the density of leaf tobacco in a tobacco rod according to another embodiment of the present invention. Since the basic concept of this embodiment is the same as that of the embodiment shown in FIG. 1, the description will focus on the differences from the embodiment shown in FIG.
• the present inspection apparatus has a mounting block 90 for mounting the tobacco mouth TR, which is a test subject.
• the mounting block 90 is a solid metal body having cylindrical holes 92 and 94 formed in two directions perpendicular to each other.
• the one hole 92 is arranged coaxially with the optical axis of the parallel light beam CB (combined light beam) for detection.
• the inner surface of the hole 92 is mirror-finished to prevent light absorption.
• the inlet and outlet of hole 92 are Under lens 96 and collimator lens 98 are provided.
• the other hole 94 is formed as a hole for inserting the tobacco rod TR, and its inner diameter is selected so that there is virtually no gap when the tobacco rod TR is inserted. .
• the present inspection apparatus has first and second light sources 12 and 14 composed of laser diodes for emitting the first and second light beams Bl and B2, respectively.
• the wavelengths of the first and second light beams Bl and B2 are selected so as to satisfy the conditions as described with reference to the apparatus shown in FIG. That is, the wavelengths of the first and second light beams Bl and B2 are set to, for example, 0.7 ⁇ m and 1.3 ⁇ , respectively, as described above.
• the first and second light beams Bl and ⁇ 2 from the first and second light sources 12 and 14 are combined by the half mirror prism 17a to form a combined light beam B12.
• the combined light beam B12 is turned to the mounting block 90 side by the prism 17b, and the cylinder lenses 19a, 19b and the collimator lens 22 Through to a convergent light beam.
• the focal point of this convergent light beam is set so as to come to the center hole 45 a of the mirror 45 arranged immediately before the mounting block 90.
• the mirror 45 has a mirror surface inclined with respect to the mounting block 90, for example, facing at an angle of 45 °, and the center hole 45 a is coaxial with the optical axis. Placed in
• a beam splitter 25 is provided between the collimator lens 22 and the mirror 45 to split the combined light beam B12. Beam for splitting the combined light beam B 12 by beam splitter 25 The beam part separated from the beam part is introduced into the composite light receiving element 27.
• the composite light receiving element 27 is an element for receiving and detecting two light beams having different wavelengths on the same optical path. In this case, the first and second light beams B 1 and B 2 It is set to match the wavelength of light. The details of the composite light receiving element will be described later.
• the amount of light received by the composite light receiving element 27 is measured by the light emission amount control circuit 36, whereby the first and second light beams Bl and B2 included in the combined light beam B12 are measured.
• the first and second projected light amounts are monitored.
• the light emission amount control circuit 36 calculates the first and second light emission amounts, controls the output of the first and second light sources 12 and 14 by feed packing, and performs the first and second light emission amounts.
• the amount of light is transmitted to the arithmetic circuit 48
• the beam portion for detection of the synthetic light beam B12 passes through the center hole 45a of the mirror 45, and passes through the cylinder lens 96 at the entrance of the mounting block 90. After being shaped into a parallel light beam, it is irradiated on the tobacco rod TR. The reflected light from the surface of the tobacco rod TR is reflected by the mirror 45 and introduced into the composite light receiving element 43 through the aspherical condenser lenses 47a and 47b.
• the composite light receiving element 43 can also receive and detect the first and second light beams Bl and B2 in the reflected light on the same optical path.
• the received light amount of the composite light receiving element 43 is measured by the arithmetic circuit 48, whereby the first and second reflected light amounts of the first and second light beams Bl and B2 are calculated. Monitored.
• the beam for inspection that has passed through the tobacco rod TR is converged by a collimator lens 98 at the exit of the mounting block 90. After being shaped into a beam, it is introduced into the composite light receiving element 57.
• the composite light receiving element 57 can also receive and detect the first and second light beams B 1 B 2 in the transmitted light on the same optical path.
• the received light amount of the composite light receiving element 57 is measured by the arithmetic circuit 48, whereby the first and second transmitted light amounts of the first and second light beams Bl and B2 are monitored. Is done.
• the first and second light quantities, the first and second reflected light quantities, and the first and second transmitted light quantities of the first and second light beams Bl and B2 obtained in this manner are described below.
• the arithmetic circuit 48 calculates the density of the tobacco leaf LS in the tobacco rod TR.
• the mode of control from the mass fluctuation detection circuit 72 to the elimination circuit 78 or the manufacturing system 80 is exactly the same as that described with reference to the apparatus shown in FIG.
• the algorithm used to calculate the density of the hour S is basically the same as that described with reference to the embodiment shown in FIG.
• the first reflected light amount of the first light beam B 1 is calculated based on the second reflected light amount of the second light beam B 2
• the measurement is performed by actually receiving and detecting the first reflected light amount of the first light beam B1. For this reason, in the present embodiment, no error occurs even when the test object has a different reflectance depending on the wavelength.
• FIG. 4 is a side view showing the composite light receiving element 100 used as the composite light receiving elements 27, 43, and 57.
• the composite light-receiving element 100 is positioned with respect to the optical axis OA of the incident light beam. It has light receiving sections 102 and 104 arranged at two different levels orthogonal to each other.
• the light receiving sections 102 and 104 are composed of semiconductor light receiving elements different from each other, and the light receiving section 102 on the primary side (upper side) emits a first beam B 1 of a short wavelength (here, 0.7 / m).
• the secondary (lower) photodetector 104 detects the second beam ⁇ 2 of a long wavelength (here, 1.3 ⁇ ) that can pass through the primary photodetector 102. I do.
• a Peltier element 106 for cooling the light receiving sections 102 and 104 is provided on the inner surface of the housing of the composite light receiving element 100.
• the first and second light beams ⁇ 1 and ⁇ 2 from the first and second light sources 12 and 14 are laser light beams and therefore each have a single wavelength. For this reason, the first and second light beams ⁇ 1 and ⁇ 2 can be detected in a mixed state in the composite light receiving element without performing processing such as wavelength separation prior to light reception. Absent.
• the Peltier element 106 by cooling the light receiving sections 1 ′ 0 2, 104 by the Peltier element 106, temperature drift and noise caused by overheating of the light receiving sections 102, 104 are obtained. This can prevent the occurrence of noise.

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• 2000
  • 2000-10-25 DE DE2000626726 patent/DE60026726T2/de not_active Expired - Lifetime
  • 2000-10-25 CN CNB008088438A patent/CN1300561C/zh not_active Expired - Fee Related
  • 2000-10-25 EA EA200101196A patent/EA003867B1/ru not_active IP Right Cessation
  • 2000-10-25 AU AU2000279568A patent/AU2000279568A1/en not_active Abandoned
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  • 2000-10-25 EP EP00970056A patent/EP1236990B1/de not_active Expired - Lifetime
  • 2000-10-25 CA CA 2370107 patent/CA2370107C/en not_active Expired - Fee Related
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